fix(relay): message loss on large queues, call wake-up throttling, identity reclaim, prekey upload

- stop counting ACK and Pong frames toward the per-connection frame window;
  draining a large queue used to trip the 429 limit, disconnect the client
  and, after eight rounds, drop the remaining envelopes
- deliver to online recipients with try_send: a recipient that stops reading
  its socket no longer pins the sender's task and memory
- throttle call wake-ups per recipient (1 per 10 s, 6 per 10 min) and
  ordinary wake-ups (1 per 5 s); collapse ids for APNs and FCM
- POST /v1/register accepts X-Sepot-Identity-Proof and lets a new device take
  over an existing identity (restore from the recovery phrase)
- POST /v1/keys uploads one-time prekeys and rotates signed/Kyber prekeys;
  PrekeysLow is sent after AUTH when fewer than 20 remain
- GET /v1/keys hands out at most 30 one-time prekeys per address per hour
- reqwest errors are logged without the URL; UnifiedPush POSTs pin the
  addresses the SSRF guard resolved; NAT64/6to4 embedded addresses are checked
- absolute AUTH deadline, at most 3 AUTH attempts, length limits on push
  endpoints and VoIP tokens
- TURN credentials live 12 h and are reissued per connection every 10 min
- global attachment storage cap (SEPOT_ATTACHMENTS_TOTAL_BYTES), nosniff and
  attachment disposition on downloads
- SEPOT_MAX_CONNS_PER_IP, /v1/ready backed by the database, graceful shutdown,
  RLIMIT_NOFILE raised to the hard limit, server-info reports source and revision
- Dockerfile: rust 1.99, GIT_SHA build arg for the image label and
  SEPOT_REVISION; Tor image on alpine 3.24

rust/Cargo.lock

@@ -274,15 +274,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "concurrent-queue"
-version = "2.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ca0197aee26d1ae37445ee532fefce43251d24cc7c166799f4d46817f1d3973"
-dependencies = [
- "crossbeam-utils",
-]
-
 [[package]]
 name = "const-oid"
 version = "0.9.6"
@@ -348,9 +339,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.9.18"
+version = "0.9.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b82ac4a3c2ca9c3460964f020e1402edd5753411d7737aa39c3714ad1b5420e"
+checksum = "dc74980687109a3b14c72fd458107bf0baa1da1a1a805e178d15501ba9b86d9d"
 dependencies = [
  "crossbeam-utils",
 ]
@@ -572,11 +563,10 @@ dependencies = [
 
 [[package]]
 name = "event-listener"
-version = "5.4.1"
+version = "5.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e13b66accf52311f30a0db42147dadea9850cb48cd070028831ae5f5d4b856ab"
+checksum = "5a23add41df1562121a9393cb065eab5146a1242410f23a644851e90cfd669d2"
 dependencies = [
- "concurrent-queue",
  "parking",
  "pin-project-lite",
 ]
@@ -826,9 +816,9 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.4.15"
+version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6cb093c84e8bd9b188d4c4a8cb6579fc016968d14c99882163cd3ff402a4f155"
+checksum = "7d29020232d6aa3fb1daca64c1127cf662cf97f254ae16c18c05b8ab635fc118"
 dependencies = [
  "atomic-waker",
  "bytes",
@@ -2380,9 +2370,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.41"
+version = "0.23.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b92b125634d9b795e7beca796cc790df15a7fb38323bf3196fda83292d06b1f"
+checksum = "0d41d731c7d2f962d1ccc364cec258de3c0e93b38c2fb3ba97ac74513048d634"
 dependencies = [
  "once_cell",
  "ring",
@@ -2404,9 +2394,9 @@ dependencies = [
 
 [[package]]
 name = "rustls-webpki"
-version = "0.103.13"
+version = "0.103.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61c429a8649f110dddef65e2a5ad240f747e85f7758a6bccc7e5777bd33f756e"
+checksum = "f3c3cf1d8b1e7d4927e2d154c3fcb02979afb9939629c62cd9048d4f07b60ac2"
 dependencies = [
  "ring",
  "rustls-pki-types",
@@ -2456,8 +2446,10 @@ dependencies = [
  "dashmap",
  "futures-util",
  "hex",
+ "hmac",
  "ipnet",
  "jsonwebtoken",
+ "libc",
  "libsignal-core",
  "libsignal-protocol",
  "prost 0.13.5",
@@ -2466,6 +2458,7 @@ dependencies = [
  "sepot-proto",
  "serde",
  "serde_json",
+ "sha1",
  "sqlx",
  "tokio",
  "tokio-util",